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Influenza update

08 June 2012 - Update number 161

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Summary

•Worldwide influenza activity is generally low.
•Influenza activity in the northern hemisphere temperate regions is continuing to decline or back to baseline levels indicating the season is ending.
•Influenza activity in tropical areas of the world is low with the exception of China Hong Kong Special Administrative Region (SAR) and Madagascar. In both areas influenza A(H3N2) is the predominantly virus circulating.
•Influenza activity in the temperate zone of the southern hemisphere is still low. Chile and Paraguay are reporting increasing ILI activity in the past couple of weeks, with 3% and 12% respectively of respiratory specimens testing positive for influenza, with predominantly influenza A(H3N2) virus detection in Chile and influenza A(H1N1)pdm virus detection in Paraguay.

• -Full version Epidemiological influenza surveillance update
  pdf, 588kb

• - Virological influenza surveillance update

Source of data

The Global Influenza Programme monitors influenza activity worldwide and publishes an update every two weeks.
The updates are based on available epidemiological and virological data sources, including FluNet (reported by the Global Influenza Surveillance and Response System) and influenza reports from WHO Regional Offices and Member States. Completeness can vary among updates due to availability and quality of data available at the time when the update is developed.

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